Racial prejudice arises, not as a result of difference, which is only one element in the total situation, but as a consequence of the interaction of more intricate dynamic relations. It arises when an "inferior" group (so designated by the group which maintains control of its habitat) is making the "superior" group's habitat its own. The superior group is constantly striving to maintain dominance over its habitat. If the inferior group accepts its position placidly and remains static no change in relative equilibrium occurs. Habitat dominance techniques become so perfected in the course of time that energy utilized in the maintenance of the habitat overflows and extends over into other habitats. (PsycINFO Database Record (c) 2006 APA, all rights reserved)